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CA2405702A1 - Device and method for measuring lung performance - Google Patents

Device and method for measuring lung performance Download PDF

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Publication number
CA2405702A1
CA2405702A1 CA002405702A CA2405702A CA2405702A1 CA 2405702 A1 CA2405702 A1 CA 2405702A1 CA 002405702 A CA002405702 A CA 002405702A CA 2405702 A CA2405702 A CA 2405702A CA 2405702 A1 CA2405702 A1 CA 2405702A1
Authority
CA
Canada
Prior art keywords
sensing member
conduit
plate member
flow
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002405702A
Other languages
French (fr)
Other versions
CA2405702C (en
Inventor
Dov Larom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FERRARIS GROUP Inc
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Individual
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Filing date
Publication date
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Publication of CA2405702A1 publication Critical patent/CA2405702A1/en
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Publication of CA2405702C publication Critical patent/CA2405702C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/74—Details of notification to user or communication with user or patient ; user input means
    • A61B5/7475—User input or interface means, e.g. keyboard, pointing device, joystick
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/087—Measuring breath flow
    • A61B5/0876—Measuring breath flow using means deflected by the fluid stream, e.g. flaps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/0823—Detecting or evaluating cough events
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/74—Details of notification to user or communication with user or patient ; user input means
    • A61B5/742—Details of notification to user or communication with user or patient ; user input means using visual displays
    • A61B5/743—Displaying an image simultaneously with additional graphical information, e.g. symbols, charts, function plots

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Veterinary Medicine (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Physics & Mathematics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Physiology (AREA)
  • Pulmonology (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The flow measurement device of the present invention incorporatesnumerous novel features. The device includes a displacement measuring device (160) to measure the position of a movable plate member (132), a self-oscillation dampener (140) to dampen oscillations of the plate member (132), one or more stiffening members engaging or incorporated into the plate member (132) to increase the resonant frequency of the plate member (132) and reduce flutter, and a conduit (124) providing for differing directions (148, 164) of air flow at different points along its length to eliminate the effects of gravity on flow measurements.

Claims (65)

1. A device for measuring respiratory air flow, comprising:
(a) a conduit having an inlet for exhaled air and an outlet for the exhaled air;
(b) a sensing member movably disposed in the conduit between the inlet and at least a portion of the outlet, the sensing member at least partially blocking the at least a portion of the conduit and moving in response to the passage of the exhaled air through the conduit; and (c) a self-oscillation dampener movably engaging the sensing member, wherein the self-oscillation dampener dampens an amplitude of oscillations of the sensing member in response to the exhaled air contacting the sensing member.
2. The device of Claim 1, wherein the self-oscillation dampener frictionally resists movement of the sensing member.
3. The device of Claim 1, wherein the self-oscillation dampener is inclined at a contact angle relative to the sensing member and the angle is 75° or less.
4. The device of Claim 1, wherein the sensing member has a length and the self-oscillation dampener engages the sensing member at a point that is at a distance of at least about 25% and no more than about 95% from a lower edge of the sensing member.
5. The device of Claim 1, wherein the sensing member includes or engages one or more stiffening members to impart rigidity to the sensing member.
6. The device of Claim 1, wherein the conduit redirects a direction of flow of the exhaled air such that at the inlet the direction of flow is substantially parallel to a surface of the sensing member and at the sensing member the direction of flow is substantially normal to the surface of the sensing member.
7. The device of Claim 1, wherein the self-oscillation dampener has a length and the length ranges from about 10 to about 150% of the height of the sensing member.
8. The device of Claim 1, further comprising a measuring device for measuring, as a function of time, at least one of a force applied to the sensing member by the exhaled air and a location of the sensing member and wherein the measuring device is at least one of a strain gauge, and a radiant energy emitter in communication with a radiant energy detector.
9. A method for measuring respiratory air flow, comprising:
(a) exhaling air into an inlet of a conduit;

(b) moving a sensing member that is movably disposed in the conduit downstream of the inlet, the sensing member at least partially blocking the conduit and moving in response to the passage of the exhaled air through the conduit;
(c) resisting movement of the sensing member with a self-oscillation dampener to dampen the amplitude of oscillations of the sensing member; and (d) measuring at least one of a force applied to the sensing member by the exhaled air and the location of the sensing member.
10. The method of Claim 9, wherein the measuring step includes:
measuring the location of the sensing member at a plurality of points in time and generating a plurality of location signals; and processing the plurality of location signals to determine a desired air flow parameter.
11. The method of Claim 9, wherein the measuring step includes:
contacting the sensing member with a radiant beam; and receiving a reflected radiant beam with a detector.
12. The method of Claim 9, wherein the sensing member includes a bar code for encoding the reflected radiant beam.
13. The method of Claim 9, wherein the sensing member includes one or more stiffening members to control a resonant frequency of the sensing member.
14. A system for measuring respiratory air flow, comprising:
(a) an inlet of a conduit for receiving exhaled air;
(b) a plate member that is movably disposed in the conduit downstream of the inlet, the plate member at least partially blocking the conduit and moving in response to the passage of the exhaled air through the conduit;
(c) a self-oscillation dampener for resisting movement of the plate member to dampen the amplitude of oscillations of the plate member; and (d) means for measuring at least one of a force applied to the plate member by the exhaled air and the location of the plate member.
15. The system of Claim 14, wherein the self-oscillation dampener frictionally resists movement of the plate.
16. The system of Claim 14, wherein the self-oscillation dampener is inclined at an angle relative to the plate and the angle is 75° or less.
17. The system of Claim 14, wherein the plate member has a length and the self-oscillation dampener engages the plate at a point that is at a distance of at least about 25%
and no more than about 95% from a lower edge of the plate.
18. The system of Claim 14, wherein the plate member includes or engages one or more stiffening members to impart rigidity to the plate member.
19. The system of Claim 14, wherein the conduit redirects a direction of flow of the exhaled air such that at the inlet the direction of flow is substantially parallel to a plane of the plate member and at the plate member the direction of flow is substantially normal to the plane of the plate member.
20. The system of Claim 14, wherein the self-oscillation dampener has a length and the length ranges from about 10 to about 150% of the height of the plate member.
21. The system of Claim 14, wherein the measuring means is at least one of a strain gauge and a radiant energy emitter in communication with a radiant energy detector.
22. A device for measuring respiratory air flow, comprising:
(a) a conduit having an inlet for exhaled air and an outlet for the exhaled air;
(b) a plate member movably disposed in the conduit between the inlet and outlet, the plate member at least partially blocking the conduit and moving in response to the passage of the exhaled air through the conduit, wherein the plate member is perforated to maintain a resonant frequency of the plate member above a selected level; and (c) an air flow measuring device for measuring the air flow through the conduit.
23. The device of Claim 22, wherein the one or more stiffening members are located at one or more peripheral edges of the plate member.
24. The device of Claim 22, wherein the one or more stiffening members are located on a downstream surface of the plate member relative to the direction of exhaled air flow.
25. The device of Claim 22, wherein the conduit redirects a direction of flow of the exhaled air such that at the inlet the direction of flow is substantially parallel to a plane of the plate member and at the plate member the direction of flow is substantially normal to the plane of the plate member.
26. The device of Claim 22, further comprising a self-oscillation dampener for controlling an amplitude of oscillations of the plate member.
27. A method for measuring respiratory air flow, comprising:
(a) exhaling air into an inlet of a conduit;
(b) moving a plate member that is movably disposed in the conduit downstream of the inlet, the plate member at least partially blocking the conduit and moving in response to the passage of the exhaled air through the conduit, wherein the plate member includes a plurality of holes passing therethrough;
(c) passing air located on a first side of the plate member through the plurality of holes to control a resonant frequency of the plate member, wherein the exhaled air contacts a second side of the plate member that is opposite to the first side of the plate member; and (d) measuring at least one of a force or pressure applied to the plate member by the exhaled air and the location of the plate member.
28. The method of Claim 27, wherein the measuring step includes:
measuring the location of the plate member at a plurality of points in time and generating a plurality of location signals; and processing the plurality of location signals to determine a desired air flow parameter.
29. The method of Claim 27, wherein the measuring step includes:
contacting the plate member with a radiant beam; and receiving a reflected radiant beam with a detector.
30. The method of Claim 29, wherein the plate member includes a bar code for encoding the reflected radiant beam.
31. The method of Claim 29, further comprising a self-oscillation dampener to control an amplitude of oscillations of the plate member.
32. A device for measuring respiratory air flow, comprising:
(a) a conduit having an inlet for exhaled air and an outlet for the exhaled air; and (b) a sensing member for measuring an air flow parameter, wherein a direction of air flow through the inlet is transverse to a direction of air flow at the sensing member and wherein the sensing member is movably disposed in the conduit between the inlet and outlet, the sensing member at least partially blocking the conduit and moving in response to the passage of the exhaled air through the conduit.
33. The device of Claim 32, wherein a plane defined by a face of the sensing member is substantially parallel to the direction of air flow at the inlet.
34. The device of Claim 32, wherein a plane of movement of the sensing member is transverse to the direction of air flow at the inlet.
35. The device of Claim 32, wherein the sensing member includes one or more stiffening members to control a resonant frequency of the sensing member.
36. The device of Claim 32, further comprising a self-oscillation dampener for controlling an amplitude of oscillations of the sensing member.
37. The device of Claim 35, wherein the stiffening members include at least one of a support member engaging the sensing member, a plurality of holes in the sensing member and a plurality of eddy currents in a portion of the sensing member.
38. A method for measuring respiratory air flow, comprising:
(a) passing exhaled air through an inlet of a conduit, the exhaled air having a first direction of flow in the inlet;
(b) contacting the exhaled air with a moveable sensing member located in the conduit between the inlet and an outlet, the exhaled air having a second direction flow adjacent to the sensing member and the sensing member at least partially blocking the conduit and moving in response to the passage of the exhaled air through the conduit; and (c) measuring an air flow parameter using a signal generated in response to movement of the sensing member in the conduit between the inlet and outlet, wherein the first direction of flow is transverse to the second direction of flow.
39. The method of Claim 38, wherein the first direction of flow is substantially normal to the second direction of flow.
40. The method of Claim 38, wherein the measuring step includes:
measuring the location of the sensing member at a plurality of points in time and generating a plurality of location signals; and processing the plurality of location signals to determine a desired air flow parameter.
41. The method of Claim 38, wherein the measuring step includes:
contacting the sensing member with a radiant beam; and receiving a reflected radiant beam with a detector.
42. The method of Claim 41, wherein the sensing member includes a bar code for encoding the reflected radiant beam.
43. The method of Claim 38, further comprising a self-oscillation dampener to control an amplitude of oscillations of the sensing member.
44. A device for measuring respiratory air flow, comprising:
(a) a conduit having an inlet for exhaled air and an outlet for the exhaled air;
(b) a plate member movably disposed in the conduit between the inlet and outlet, the plate member at least partially blocking the conduit and moving in response to the passage of the exhaled air through the conduit; and (c) a measuring device for measuring at least one of a pressure or force applied against the plate member by the exhaled air and generating a measurement signal, the measuring device being located on the plate member.
45. The device of Claim 44, wherein an orifice is located between the plate member and a wall of the conduit, the exhaled air having a first direction of flow at the inlet and a second direction of flow at the orifice and the first direction of flow is transverse to the second direction of flow.
46. The device of Claim 45, wherein a plane defined by a face of the plate member is substantially parallel to the first direction of air flow at the inlet.
47. The device of Claim 45, wherein a plane of movement of the plate member is transverse to the first direction of air flow at the inlet.
48. The device of Claim 44, wherein the plate member includes one or more stiffening members to control a resonant frequency of the plate member.
49. The device of Claim 44, further comprising a self-oscillation dampener for controlling an amplitude of oscillations of the plate member.
50. The device of Claim 48, wherein the stiffening members include at least one of a support member engaging the plate member, a plurality of holes in the plate member and a plurality of eddy currents in a portion of the plate member.
51. A device for measuring respiratory air flow, comprising:
(a) a conduit having an inlet for exhaled air and an outlet for the exhaled air;
(b) a sensing member movably disposed in the conduit between the inlet and outlet, the sensing member at least partially blocking the conduit and moving in response to the passage of the exhaled air through the conduit; and (c) a measuring device for measuring, at a plurality of points in time, the location of the sensing member and generating a plurality of location signals wherein the displacement measuring device includes a sound emitter in communication with a sound detector; and (d) a processing unit, in communication with the measuring device, for receiving the plurality of location signals and determining a plurality of positions of the plate member that correspond to the plurality of location signals.
52. The device of Claim 51, further comprising:
(e) an electronic memory, in communication with the processing unit, for recording the plurality of locations at the plurality of points in time.
53. The device of Claim 51, wherein the sound energy is ultrasound energy.
54. The device of Claim 51, wherein the sensing member includes or engages one or more stiffening members to impart rigidity to the sensing member.
55. The device of Claim 53, wherein the one or more stiffening members are located on a downstream surface of the sensing member relative to the direction of exhaled air flow.
56. The device of Claim 51, wherein the conduit redirects a direction of flow of the exhaled air such that at the inlet the direction of flow is substantially parallel to a surface of the sensing member and at the sensing member the direction of flow is substantially normal to the surface of the sensing member.
57. The device of Claim 51, further comprising a self-oscillation dampener to resist movement of the sensing member.
58. A method for determining exhaled air flow, comprising:
(a) exhaling air into an inlet of a conduit;
(b) moving a sensing member that is movably disposed in the conduit downstream of the inlet, the sensing member at least partially blocking the conduit and moving in response to the passage of the exhaled air through the conduit;
(c) transmitting sound energy;
(d) receiving reflected sound energy that is reflected by the sensing member;
(e) determining a location of the sensing member and generating a location signal;
and (f) processing the location signal to determine a desired air flow parameter.
59. The method of Claim 58, wherein the measuring step includes:
contacting the sensing member with a sound energy; and receiving reflected sound energy with a detector.
60. The method of Claim 59, wherein the sensing member includes a bar code for encoding the reflected sound energy beam.
61. The method of Claim 59, wherein the sensing member includes one or more stiffening members to control a resonant frequency of the sensing member.
62. The method of Claim 59, further comprising a self-oscillation dampener to control an amplitude of oscillation of the sensing member.
63. The system of Claim 59, wherein the sound energy is emitted one or more piezoelectric crystals.
64. The system of Claim 59, wherein the sound energy is modulated.
65. The system of Claim 59, wherein a conduit redirects a direction of flow of the exhaled air such that at the inlet the direction of flow is substantially parallel to a surface of the sensing member and at the sensing member the direction of flow is substantially normal to the surface of the sensing member.
CA2405702A 2000-04-07 2001-04-05 Device and method for measuring lung performance Expired - Fee Related CA2405702C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/545,624 US6447459B1 (en) 2000-04-07 2000-04-07 Device and method for measuring lung performance
US09/545,624 2000-04-07
PCT/US2001/011266 WO2001076455A2 (en) 2000-04-07 2001-04-05 Device and method for measuring lung performance

Publications (2)

Publication Number Publication Date
CA2405702A1 true CA2405702A1 (en) 2001-10-18
CA2405702C CA2405702C (en) 2010-08-03

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US (1) US6447459B1 (en)
EP (1) EP1267719B1 (en)
JP (3) JP5404982B2 (en)
CN (6) CN100444792C (en)
AU (2) AU2001253213B2 (en)
CA (1) CA2405702C (en)
HK (6) HK1052285A1 (en)
WO (1) WO2001076455A2 (en)

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HK1098653A1 (en) 2007-07-27
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HK1098654A1 (en) 2007-07-27
CN1486160A (en) 2004-03-31
EP1267719B1 (en) 2014-05-07
CA2405702C (en) 2010-08-03
EP1267719A4 (en) 2007-08-01
AU2001253213B2 (en) 2005-06-30
HK1098652A1 (en) 2007-07-27
JP2012228530A (en) 2012-11-22
HK1052285A1 (en) 2003-09-11
WO2001076455A3 (en) 2002-07-18
US6447459B1 (en) 2002-09-10
HK1098655A1 (en) 2007-07-27
CN1860992A (en) 2006-11-15
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CN1860996B (en) 2012-09-05
CN100459933C (en) 2009-02-11
CN1860994B (en) 2012-09-05
EP1267719A2 (en) 2003-01-02
CN1289033C (en) 2006-12-13
HK1098331A1 (en) 2007-07-20
WO2001076455A2 (en) 2001-10-18
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CN1860994A (en) 2006-11-15
JP5404982B2 (en) 2014-02-05

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